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113
Sep 17, 2013
09/13
by
Ilaria Gallina; Giuseppe Castaldi; Vincenzo Galdi; Emiliano Di Gennaro; Antonello Andreone
texts
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It has recently been shown that the transmission of electromagnetic fields through sub-wavelength slits (parallel to the electric field direction) in a thin metallic screen can be greatly enhanced by covering one side of the screen with a metallic cut-wire array laid on a dielectric layer. In this Letter, we show that a richer phenomenology (which involves both electric- and magnetic-type resonances) can be attained by pairing a second cut-wire array at the other side of the screen. Via a...
Source: http://arxiv.org/abs/0912.4256v3
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29
Sep 22, 2013
09/13
by
Casey Meakin; David Arnett
texts
eye 29
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We investigate simulated turbulent flow within thermally driven stellar convection zones. Different driving sources are studied, including cooling at the top of the convectively unstable region, as occurs in surface convection zones; and heating at the base by nuclear burning. The transport of enthalpy and kinetic energy, and the distribution of turbulent kinetic energy dissipation are studied. We emphasize the importance of global constraints on shaping the quasi-steady flow characteristics,...
Source: http://arxiv.org/abs/1001.4138v1
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34
Sep 20, 2013
09/13
by
D. Riquelme; M. A. Amo-Baladron; J. Martin-Pintado; R. Mauersberger; L. Bronfman; S. Martin
texts
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We study the disk-halo interaction, in the context of orbits and Giant Molecular loops (GMLs) in the Galactic center (GC) region. We present a large scale survey in the central kpc in SiO(J=2-1), HCO$^+$(J=1-0) and H$^{13}$CO$^+$ (J=1-0), observations in 3mm lines toward a region in two clumps M+5.3-0.3 and M-3.8+0.9 placed in the foot point of two molecular loops, and observations toward selected positions, to trace accretion of the gas from the halo
Source: http://arxiv.org/abs/1002.0643v1
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Jul 19, 2013
07/13
by
Michael V. Bebronne
texts
eye 80
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The static vacuum spherically symmetric solutions of massive gravity theories possess two integration constant: the mass M and a scalar charge S. The presence of this scalar charge reflects the modification of the gravitational interaction as compared to General Relativity. Surprisingly, these solutions are non-linear even at large distances from the sources, implying that their asymptotic behavior is different from that obtained in the linear perturbation theory. The aim of this paper is to...
Source: http://arxiv.org/abs/1005.4547v2
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26
Sep 21, 2013
09/13
by
Jinyoung Lee; Seoktae Lee
texts
eye 26
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When anisotropy is involved, the wave equation becomes simultaneous partial differential equations that are not easily solved. Moreover, when the anisotropy occurs due to both permittivity and permeability, these equations are insolvable without a numerical or an approximate method. The problem is essentially due to the fact neither $\e$ nor $\m$ can be extracted from the curl term, when they are in it. The terms $\na\times {\bf E}$ (or ${\bf H})$ and $\na\times \e{\bf E}$ (or $\;\m{\bf H})$...
Source: http://arxiv.org/abs/1008.5212v1
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27
Sep 19, 2013
09/13
by
Xiaoqiang Xie; Changmin Li
texts
eye 27
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We consider the evolutionary MHD systems, and study the the regularity and vanishing viscosity limit of the 3-D viscous system in a class of bounded domains with a slip boundary condition. We derive the convergence is in H^{2k+1}, for k>0, if the initial date holds some sufficient conditions.
Source: http://arxiv.org/abs/1009.1258v1
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Sep 19, 2013
09/13
by
Jing Yu; Jingsong He; Yi Cheng; Jingwei Han
texts
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A new (1+1)-dimensional integrable system, i. e. the super coupled Korteweg-de Vries (cKdV) system, has been constructed by a super extension of the well-known (1+1)-dimensional cKdV system. For this new system, a novel symmetry constraint between the potential and eigenfunction can be obtained by means of the binary nonlinearization of its Lax pairs. The constraints for even variables are explicit and the constraints for odd variables are implicit. Under the symmetry constraint, the spacial...
Source: http://arxiv.org/abs/1009.3368v1
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47
Sep 21, 2013
09/13
by
Xiangao Liu; Lanming Liu
texts
eye 47
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In this paper, we establish a blow-up criterion for the compressible liquid crystals equations in terms of the gradient of the velocity only, similar to the Beale-Kato-Majda criterion \cite{majda} for ideal incompressible flows and the criterion obtained by Huang and Xin \cite{xin2} for the compressible Navier-Stokes equations.
Source: http://arxiv.org/abs/1011.4399v2
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Sep 21, 2013
09/13
by
Wanfeng Yan; Ryan Woodard; Didier Sornette
texts
eye 50
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Identifying unambiguously the presence of a bubble in an asset price remains an unsolved problem in standard econometric and financial economic approaches. A large part of the problem is that the fundamental value of an asset is, in general, not directly observable and it is poorly constrained to calculate. Further, it is not possible to distinguish between an exponentially growing fundamental price and an exponentially growing bubble price. We present a series of new models based on the...
Source: http://arxiv.org/abs/1011.5343v1
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6.0
Dec 1, 2018
12/18
by
City of McKinney, TX
movies
eye 6
favorite 0
comment 0
Topics: Texas, McKinney, City of McKinney, TX, Government Access TV, Community Media, PEG, Youtube,...
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5.0
Nov 29, 2018
11/18
by
City of Reno, NV
movies
eye 5
favorite 0
comment 0
The eleven men recently graduated from the police academy, but they couldn't go any further with the police force because of the downturn in the economy. Now the volunteer reserve officers will work without pay for a minimun of 20 hours a month to maintain their certification and garner on-the-job training.
Topics: Nevada, Reno, City of Reno, NV, Government Access TV, Community Media, PEG, Youtube, swearing, in,...
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17
movies
eye 17
favorite 0
comment 0
Samsung Galaxy Tab commercial
Topics: tweakers, 1829, Samsung Galaxy Tab commercial
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34
Sep 18, 2013
09/13
by
Felix Brandt
texts
eye 34
favorite 0
comment 0
We propose a systematic methodology for defining tournament solutions as extensions of maximality. The central concepts of this methodology are maximal qualified subsets and minimal stable sets. We thus obtain an infinite hierarchy of tournament solutions, which encompasses the top cycle, the uncovered set, the Banks set, the minimal covering set, the tournament equilibrium set, the Copeland set, and the bipartisan set. Moreover, the hierarchy includes a new tournament solution, the minimal...
Source: http://arxiv.org/abs/0803.2138v4
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38
Sep 17, 2013
09/13
by
Gérard Ben Arous; Alexander Fribergh; Nina Gantert; Alan Hammond
texts
eye 38
favorite 0
comment 0
We consider a biased random walk $X_n$ on a Galton-Watson tree with leaves in the sub-ballistic regime. We prove that there exists an explicit constant $\gamma= \gamma(\beta) \in (0,1)$, depending on the bias $\beta$, such that $X_n$ is of order $n^{\gamma}$. Denoting $\Delta_n$ the hitting time of level $n$, we prove that $\Delta_n/n^{1/\gamma}$ is tight. Moreover we show that $\Delta_n/n^{1/\gamma}$ does not converge in law (at least for large values of $\beta$). We prove that along the...
Source: http://arxiv.org/abs/0711.3686v4
/MFMA/Publications and Media Releases/Section 71 Information (In-year Management, Monitoring and Reporting)/2008-09/3rd Quarter/List of Non Compliance to Section 71 of the MFMA - 27 May 2009.pdf
Topics: Local Government, MFMA, Municipal Financial Management Act, Finance, Governance, Management,...
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6.0
May 6, 2010
05/10
by
Sverigedemokraterna
audio
eye 6
favorite 0
comment 0
Sverigedemokraternas radio med Staffan Arnberg och Lennart Struve.
Topics: radio, sd, sverigedemokraterna, 2010
Source: http://www.radiosd.se
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75
audio
eye 75
favorite 0
comment 0
Une emission pour annoncer le camp No Border de Bruxelles du 27 septembre au 3 octobre 2010. Une piece radiophonique de lutte par le collectif B.A.-MEMS(E) appelee BIENVENUE EN EUROPE, un compte rendu de l'occupation du chantier du centre ferme 127ter en construction, une vision plus globale sur les migrations d'un point de vue de l'Amerique du Sud. Enregistre a Radio Air Libre: http://www.radioairlibre.be/ Site du camp NoBorder a bruxelles: http://www.noborderbxl.eu.org/
Topics: noborder, bruxelles
The Bullet is the student newspaper at the University of Mary Washington. The paper began publication in 1921 and currently continues to be published by UMW students. It ceased publication for a short time at the end of the 1923-24 academic year but began publication again in 1927. Unfortunately, none of the 1921, 1924, or 1927 issues have been located.
Topics: The Bullet, University of Mary Washington, Mary Washington College, College student newspapers and...
New Xbox, Onlive preview, iPhone 4 issues, Swype for EVO, your Twitter questions, and more.
Topics: twit, twich, this-week-in-computer-hardware, Patrick Norton, Ryan Shrout
Imagine Detroit :: Capturing hearts and imaginations (Glenn R. Plummer) to join the volunter force or contribute, make checks payable to: Imagine Detroit 615 Griswold St. Suite 3500 Detroit, Mi 48226 313.344.0690 or call Plummer for Congress 313.355.VOTE (8683) or visit plummerforcongress.com
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Oct 29, 2014
10/14
by
Uchida, Kunitoshi; Dezaki, Katsuya; Damdindorj, Boldbaatar; Inada, Hitoshi; Shiuchi, Tetsuya; Mori, Yasuo; Yada, Toshihiko; Minokoshi, Yasuhiko; Tominaga, Makoto
texts
eye 40
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This article is from Diabetes , volume 60 . Abstract OBJECTIVE: TRPM2 is a Ca2+-permeable nonselective cation channel activated by adenosine dinucleotides. We previously demonstrated that TRPM2 is activated by coapplication of heat and intracellular cyclic adenosine 5′-diphosphoribose, which has been suggested to be involved in intracellular Ca2+ increase in immunocytes and pancreatic β-cells. To clarify the involvement of TRPM2 in insulin secretion, we analyzed TRPM2 knockout (TRPM2-KO)...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3012163
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34
Oct 28, 2014
10/14
by
Moura, Alexandre Pinho; Carvalho, Geraldo Andrade; Moscardini, Valeria Fonseca; Lasmar, Olinto; Rezende, Denise Tourino; Marques, Marcio Candeias
texts
eye 34
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This article is from Journal of Insect Science , volume 10 . Abstract This research aimed to assess the toxicity of the pesticides abamectin 18 CE (0.02 g a.i. L-1), carbaryl 480 SC (1.73 g a.i. L-1), sulfur 800 GrDA (4.8 g a.i. L-1), fenitrothion 500 CE (0.75 g a.i. L-1), methidathion 400 CE (0.4 g a.i. L-1), and trichlorfon 500 SC (1.5 g a.i. L-1) as applied in integrated apple production in Brazil on the survival, oviposition capacity, and egg viability of the lacewing, Chrysoperla externa...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016710
Gnosis - The Human Experience Jamendo Album #059832 Tracklisting: 01 - The Human Experience 02 - The Last Thing You Remembered Before You Woke Up 03 - The Earth Is So Small Now Please read the Readme.txt and License.txt files for important origin and licensing information.
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33
Sep 19, 2013
09/13
by
Piotr Zenczykowski
texts
eye 33
favorite 0
comment 0
The question of the relative size of two independent penguin amplitudes is studied using the data on the B^+ to pi^+ K^*0, and B^+ to K^+ \bar{K}^*0 decays. Our discussion involves a Regge-phenomenology-based estimate of SU(3) breaking in the final quark-pair-creating hadronization process. The results are in agreement with earlier estimates of the relative size of the two penguins obtained from B^+ to pi^+ K^0, K^+ \bar{K}^0.
Source: http://arxiv.org/abs/1010.5600v1
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34
Sep 22, 2013
09/13
by
Mark Kaminski; Gert Smolka
texts
eye 34
favorite 0
comment 0
Propositional type theory, first studied by Henkin, is the restriction of simple type theory to a single base type that is interpreted as the set of the two truth values. We show that two constants (falsity and implication) suffice for denotational and deductive completeness. Denotational completeness means that every value of the full set-theoretic type hierarchy can be described by a closed term. Deductive completeness is shown for a sequent-based proof system that extends a propositional...
Source: http://arxiv.org/abs/1001.4021v1
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28
Sep 20, 2013
09/13
by
Karim Benakli
texts
eye 28
favorite 0
comment 0
A very large extra dimension may contain many localized branes. We discuss the possibility to formulate such models as a spin system where each spin indicates the supersymmetry direction preserved by the corresponding brane. In the evolution of the universe, the extra dimensions might have ended into a vacuum made of patches with different orientation of the spins, responsible for the observed breaking of supersymmetry. We discuss the limit where the separation of these patches is by very thin...
Source: http://arxiv.org/abs/1002.0334v2
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86
Sep 20, 2013
09/13
by
Jean-Marie Poumirol; Alessandro Cresti; Stephan Roche; Walter Escoffier; Michel Goiran; Xinran Wang; Xiaolin Li; Hongjie Dai; Bertrand Raquet
texts
eye 86
favorite 0
comment 0
We report on (magneto)-transport experiments in chemically derived narrow graphene nanoribbons under high magnetic fields (up to 60 Tesla). Evidences of field-dependent electronic confinement features are given, and allow estimating the possible ribbon edge symmetry. Besides, the measured large positive magnetoconductance indicates a strong suppression of backscattering induced by the magnetic field. Such scenario is supported by quantum simulations which consider different types of underlying...
Source: http://arxiv.org/abs/1002.4571v1
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64
Sep 17, 2013
09/13
by
Vadim M. Apalkov; Tapash Chakraborty
texts
eye 64
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comment 0
Here we report from our theoretical studies that in biased bilayer graphene, one can induce phase transitions from an incompressible state to a compressible state by tuning the bandgap at a given electron density. Likewise, variation of the density with a fixed bandgap results in a transition from the FQHE states at lower Landau levels to compressible states at intermediate Landau levels and finally to FQHE states at higher Landau levels. This intriguing scenario of tunable phase transitions in...
Source: http://arxiv.org/abs/1003.0378v1
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84
Sep 17, 2013
09/13
by
Wenjun Li; YingYing Fan; Gongwei Liu
texts
eye 84
favorite 0
comment 0
In this paper, the lepton flavor violating $\tau^- \to \mu^-PP (PP=K^+K^-,K^0\bar{K}^0,\pi^+\pi^-,\pi^0\pi^0)$ decays are studied in the framework of the two Higgs doublet model(2HDM) III. We calculate these decays branching ratios and get the bounds of model parameter $|\lambda_{\tau\mu}|$ from the experimental upper limits. Our results show that, the neutral Higgs bosons have tree-level contributions to these decays. Among these decays, the $\tau^- \to \mu^- K^+K^-$ decay is most sensitive to...
Source: http://arxiv.org/abs/1003.1433v1
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36
Sep 21, 2013
09/13
by
Krzysztof Szajowski
texts
eye 36
favorite 0
comment 0
We register a random sequence which has the following properties: it has three segments being the homogeneous Markov processes. Each segment has his own one step transition probability law and the length of the segment is unknown and random. It means that at two random successive moments (they can be equal also and equal zero too) the source of observations is changed and the first observation in new segment is chosen according to new transition probability starting from the last state of the...
Source: http://arxiv.org/abs/0901.3795v3
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31
Sep 22, 2013
09/13
by
Tim D. Cochran; Shelly Harvey; Constance Leidy
texts
eye 31
favorite 0
comment 0
For each sequence of polynomials, P=(p_1(t),p_2(t),...), we define a characteristic series of groups, called the derived series localized at P. Given a knot K in S^3, such a sequence of polynomials arises naturally as the orders of certain submodules of the sequence of higher-order Alexander modules of K. These group series yield new filtrations of the knot concordance group that refine the (n)-solvable filtration of Cochran-Orr-Teichner. We show that the quotients of successive terms of these...
Source: http://arxiv.org/abs/0906.1373v2
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29
Sep 19, 2013
09/13
by
Chris Heunen; Nicolaas P. Landsman; Bas Spitters
texts
eye 29
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comment 0
New foundations for quantum logic and quantum spaces are constructed by merging algebraic quantum theory and topos theory. Interpreting Bohr's "doctrine of classical concepts" mathematically, given a quantum theory described by a noncommutative C*-algebra A, we construct a topos T(A), which contains the "Bohrification" B of A as an internal commutative C*-algebra. Then B has a spectrum, a locale internal to T(A), the external description S(A) of which we interpret as the...
Source: http://arxiv.org/abs/0909.3468v2
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28
Sep 19, 2013
09/13
by
George Tsoupros
texts
eye 28
favorite 0
comment 0
The vacuum activity generated by the curvature of the Schwarzschild black-hole geometry close to the event horizon is studied for the case of a massless, conformal scalar field. The associated approximation to the unknown, exact propagator in the Hartle-Hawking vacuum state for small values of the radial coordinate above $ r = 2M$ results in an analytic expression which manifestly features its dependence on the background space-time geometry. This approximation to the Hartle-Hawking scalar...
Source: http://arxiv.org/abs/0909.4886v2
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35
Sep 22, 2013
09/13
by
Sudip Bhattacharyya
texts
eye 35
favorite 0
comment 0
Measurement of at least three independent parameters, for example, mass, radius and spin frequency, of a neutron star is probably the only way to understand the nature of its supranuclear core matter. Such a measurement is extremely difficult because of various systematic uncertainties. The lack of knowledge of several system parameter values gives rise to such systematics. Low-mass X-ray binaries, which contain neutron stars, provide a number of methods to constrain the stellar parameters....
Source: http://arxiv.org/abs/1001.1642v1
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45
Sep 22, 2013
09/13
by
Peter Connor; Matthias Weber
texts
eye 45
favorite 0
comment 0
Using Traizet's regeneration method, we prove the existence of many new 3-dimensional families of embedded, doubly periodic minimal surfaces. All these families have a foliation of 3-dimensional Euclidean space by vertical planes as a limit. In the quotient, these limits can be realized conformally as noded Riemann surfaces, whose components are copies of C* with finitely many nodes. We derive the balance equations for the location of the nodes and exhibit solutions that allow for surfaces of...
Source: http://arxiv.org/abs/1001.2496v1
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29
Sep 22, 2013
09/13
by
Thomas Duquesne
texts
eye 29
favorite 0
comment 0
In this paper we discuss Hausdorff and packing measures of random continuous trees called stable trees. Stable trees form a specific class of L\'evy trees (introduced by Le Gall and Le Jan in 1998) that contains Aldous's continuum random tree (1991) which corresponds to the Brownian case. We provide results for the whole stable trees and for their level sets that are the sets of points situated at a given distance from the root. We first show that there is no exact packing measure for levels...
Source: http://arxiv.org/abs/1001.5329v1
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30
Sep 17, 2013
09/13
by
Th. Henning; D. Semenov; St. Guilloteau; A. Dutrey; F. Hersant; V. Wakelam; E. Chapillon; R. Launhardt; V. Pietu; K. Schreyer
texts
eye 30
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We studied several representative circumstellar disks surrounding the Herbig Ae star MWC 480 and the T Tauri stars LkCa 15 and DM Tau at (sub-)millimeter wavelengths in lines of CCH. Our aim is to characterize photochemistry in the heavily UV-irradiated MWC 480 disk and compare the results to the disks around cooler T Tauri stars. We detected and mapped CCH in these disks with the IRAM Plateau de Bure Interferome- ter in the C- and D-configurations in the (1-0) and (2-1) transitions. Using an...
Source: http://arxiv.org/abs/1003.5793v1
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47
Sep 22, 2013
09/13
by
Asan Damanik
texts
eye 47
favorite 0
comment 0
Neutrino masses arise via a seesaw mechanism and its mass hierarchy, with assumption that heavy Majorana neutrino mass matrix subject to $\mu-\tau$ symmetry and invariant under a cyclic permutation, are evaluated. Within this scenario, the neutrino masses: $\left|m_{1}\right|=\left|m_{2}\right|
Source: http://arxiv.org/abs/1004.1457v2
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28
Sep 22, 2013
09/13
by
G. Gervais; Kun Yang
texts
eye 28
favorite 0
comment 0
We show in this Letter that the ground state degeneracy associated with the presence of non-Abelian anyons can be probed by using an adiabatic cooling process based on the non-Abelian entropy. In particular, we show that when the number of such anyons is increased adiabatically at sufficiently low temperatures, the non-Abelian liquid undergoes cooling, whereas heating occurs in the Abelian case. Estimates are provided for the cooling power produced by the non-Abelian anyon refrigerator, and its...
Source: http://arxiv.org/abs/1004.1580v1
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47
Sep 22, 2013
09/13
by
E. Kandelaki; A. F. Volkov; K. B. Efetov; V. T. Petrashov
texts
eye 47
favorite 0
comment 0
We study the variation of the differential conductance $G=dj/dV$ of a normal metal wire in a Superconductor/Normal metal heterostructure with a cross geometry under external microwave radiation applied to the superconducting parts. Our theoretical treatment is based on the quasiclassical Green's functions technique in the diffusive limit. Two limiting cases are considered: first, the limit of a weak proximity effect and low microwave frequency, second, the limit of a short dimension (short...
Source: http://arxiv.org/abs/1004.2845v1
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37
Sep 23, 2013
09/13
by
Brian C. Tiburzi
texts
eye 37
favorite 0
comment 0
Exact chiral symmetry at finite lattice spacing would preclude the axial anomaly. In order to describe a continuum quantum field theory of Dirac fermions, lattice actions with purported exact chiral symmetry must break the flavor-singlet axial symmetry. We demonstrate that this is indeed the case by using a minimally doubled fermion action. For simplicity we consider the Abelian axial anomaly in two dimensions. At finite lattice spacing and with gauge interactions, the axial anomaly arises from...
Source: http://arxiv.org/abs/1006.0172v3
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35
Sep 23, 2013
09/13
by
James F. Davis
texts
eye 35
favorite 0
comment 0
This is a survey of some of the work of Tom Farrell and Lowell Jones. This is the lead article of a special issue of the Pure and Applied Mathematics Quarterly. This issue is published in conjunction with the conference "Geometry,Topology, and their Interactions" held in Morelia, Mexico.
Source: http://arxiv.org/abs/1006.1489v2
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29
Sep 19, 2013
09/13
by
M. P. Nowak; B. Szafran
texts
eye 29
favorite 0
comment 0
We study avoided crossings opened by spin-orbit interaction in the energy spectra of one- and two-electron anisotropic quantum dots in perpendicular magnetic field. We find that for simultaneously present Rashba and Dresselhaus interactions the width of avoided crossings and the effective $g$ factor depend on the dot orientation within (001) crystal plane. The extreme values of these quantities are obtained for [110] and [1$\bar{1}$0] orientations of the dot. The width of singlet-triplet...
Source: http://arxiv.org/abs/1009.5637v1
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33
Sep 19, 2013
09/13
by
P. Astier; J. Guy; R. Pain; C. Balland
texts
eye 33
favorite 0
comment 0
We present a forecast of dark energy constraints that could be obtained from a large sample of distances to Type Ia supernovae detected and measured from space. We simulate the supernova events as they would be observed by a EUCLID-like telescope with its two imagers, assuming those would be equipped with 4 visible and 3 near infrared swappable filters. We account for known systematic uncertainties affecting the cosmological constraints, including those arising through the training of the...
Source: http://arxiv.org/abs/1010.0509v1
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37
Sep 19, 2013
09/13
by
M. Ghasemi Nezhadhaghighi; M. A. Rajabpour
texts
eye 37
favorite 0
comment 0
In complex systems with fractal properties the scale invariance has an important rule to classify different statistical properties. In two dimensions the Loewner equation can classify all the fractal curves. Using the Weierstrass-Mandelbrot (WM) function as the drift of the Loewner equation we introduce a large class of fractal curves with discrete scale invariance (DSI). We show that the fractal dimension of the curves can be extracted from the diffusion coefficient of the trend of the...
Source: http://arxiv.org/abs/1010.1631v2
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Sep 21, 2013
09/13
by
M. A. Reniers; T. A. C. Willemse
texts
eye 32
favorite 0
comment 0
Kripke Structures and Labelled Transition Systems are the two most prominent semantic models used in concurrency theory. Both models are commonly believed to be equi-expressive. One can find many ad-hoc embeddings of one of these models into the other. We build upon the seminal work of De Nicola and Vaandrager that firmly established the correspondence between stuttering equivalence in Kripke Structures and divergence-sensitive branching bisimulation in Labelled Transition Systems. We show that...
Source: http://arxiv.org/abs/1011.0136v1
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34
Sep 21, 2013
09/13
by
Andreas-Stephan Elsenhans; Jörg Jahnel
texts
eye 34
favorite 0
comment 0
We describe a method to compute the Brauer-Manin obstruction for smooth cubic surfaces over $\bbQ$ such that $\Br(S)/\Br(\bbQ)$ is of order two or four. This covers the vast majority of the cases when this group is non-zero. Our approach is to associate a Brauer class with every Galois invariant double-six. We show that all order two Brauer classes may be obtained in this way. We also recover Sir Peter Swinnerton-Dyer's result that $\Br(S)/\Br(\bbQ)$ may take only five values.
Source: http://arxiv.org/abs/1011.1430v1
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Sep 21, 2013
09/13
by
Florent Perez; Joel Cibert; Masha Vladimirova; Denis Scalbert
texts
eye 48
favorite 0
comment 0
We theoretically describe the spin excitation spectrum of a two dimensional electron gas embedded in a quantum well with localized magnetic impurities. Compared to the previous work, we introduce equations that allow to consider the interplay between the Coulomb interaction of delocalized electrons and the $sd$ exchange coupling between electrons and magnetic impurities. Strong qualitative changes are found : mixed waves propagate below the single particle continuum, an anticrossing gap is open...
Source: http://arxiv.org/abs/1011.4422v1
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35
Sep 23, 2013
09/13
by
C Maor
texts
eye 35
favorite 0
comment 0
In the repeated Prisoner's Dilemma, when every player has a different discount factor, the grim-trigger strategy is an equilibrium if and only if the discount factor of each player is higher than some threshold. What happens if the players have incomplete information regarding the discount factors? In this work we look at repeated games in which each player has incomplete information regarding the other player's discount factor, and ask when a pair of grim-trigger strategies is an equilibrium....
Source: http://arxiv.org/abs/1012.3117v1
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25
Feb 19, 2018
02/18
by
Hoganvsflair
movies
eye 25
favorite 0
comment 0
Twitch
Topics: twitch, livestream
